<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        div{
            font-variant:small-caps
            /* text-transform:capitalize */
            /* lowercase */
            /* uppercase */ /* 将文本变成大写 */
        }
    </style>
</head>
<body>
    <div>
            hello world
    </div>
    HELLO WORLD
</body>
</html>